Pope Francis blesses a child as he rides in the popemobile to celebrate Mass in Rio de Janeiro on July 28. Hundreds of thousands of young people slept under chilly skies in the white sand of Copacabana beach awaiting the pope's final Mass for World Youth Day. Jorge Saenz, AP

Pope Francis waves at people standing along the beachfront in Rio de Janeiro as hundreds of thousands of Catholics wait for his arrival for the final Mass. Yasuyoshi Chiba, AFP/Getty Images

Francis wrapped up his first foreign trip with a Mass that drew a reported 3 million people. Felipe Dana, AP

A man kneels to pray on the shore of Copacabana beach at sunrise. Yasushioi Chiba, AFP/Getty Images

A Catholic pilgrim attending World Youth Day who spent the night sleeping on Copacabana beach wakes up on July 28. Yasuyoshi Chiba, AFP/Getty Images

Pope Francis meets with cardinals and bishops at the Archbishop's Palace on July 27 in Rio de Janeiro. Pool photo by Luca Zennaro

Thousands of young Catholic pilgrims attending World Youth Day gather at Copacabana Beach for a prayer vigil with Pope Francis. Vanderlei Almeida, AFP/Getty Images

Nuns watch bathers on Copacabana Beach as they wait for a night service with Pope Francis. Felipe Dana, AP

Thousands of young Catholic pilgrims wait for a religious service to begin on Copacabana Beach. Vanderlei Almeida, AFP/Getty Images

Pilgrims sleep on a road along the Copacabana beachfront as they wait for a night vigil service with Pope Francis for World Youth Day in Rio de Janeiro, Brazil, Saturday, July 27, 2013. Francis Will preside over an evening vigil service on Copacabana beach that is expected to draw more than 1 million young people. (AP Photo/Felipe Dana) ORG XMIT: XFD105 Felipe Dana AP

Pope Francis kisses a baby as he arrives to celebrate the Way of the Cross at the Copacabana Beach. L'Osservatore Romano via AP

Pope Francis celebrates the Way of the Cross at the Copacabana Beach. The pontiff presided over one of the most solemn rituals in the church, a procession re-enacting Christ's crucifixion. L'Osservatore Romano via AP